Abstract 4654: Plasma, tissue and tumor pharmacokinetics of PM060184 in NSCL xenograft mouse model

Abstract

Abstract Background: PM060184 is new marine derived tubulin-binding agent originally isolated from the sponge Lithoplocamia lithistoides. PM060184 has shown potent antitumor activity in vivo against a panel of different tumor xenografted models such as colon, gastric, NSCLC, prostate and renal. Also, PM060184 has demonstrated to have a potent in vitro and in vivo activity in P-gp overexpressing cells. PM060184 is currently under evaluation in Phase I clinical studies in patients with advanced cancer diseases. Material and Methods: Athymic female nu/nu mice were subcutaneously implanted with H460 (NSCLC). Tumor bearing animals were randomly allocated into experimental groups (efficacy or pharmacokinetics -PK-). The animals belonging to the efficacy study received three iv doses in a weekly (q7dx3) schedule of PM060184 at 16 mg/kg or placebo. The antitumor activity was followed by the change in tumor volume for treated and placebo groups. The PK group received a single dose of PM060184 at 16 mg/kg. Then, plasma, tissue (brain, spleen, lung, muscle and heart) and tumor samples (N=3-4/sampling time) were collected at different times and up to 96 h post-administration. Tissue and tumor samples were diluted and homogenized using Precellys®24 bead beating technology. Once homogenized the samples were processed as per plasma. PM060184 was detected in plasma, tissue and tumor extracts by electrospray ionization/tandem mass spectrometry after extraction by supported liquid extraction (SLE). Results: The mean maximum plasma concentration (Cmax) was 2,452.5 ng/mL. The area under curve (AUC) was 2,963 ng*hr/mL. The plasma clearance was 5,398.5 mL/hr/kg. The volume of distribution at steady state was 880.7 mL/kg. The terminal half-life was 4.7 hr. The AUC0-tlast values for brain, spleen, lung, muscle and heart were 216.2, 7,402.9, 3,857.7, 2,614.6 and 2,929.5 ng*hr/g, respectively; however the AUC value for H460 xenografted tumors was 51,321.4 ng*hr/g (tlast is 96 hours for tumor, 8 hours for brain and 24 hours for the other tissues). Conclusion: PM060184 showed similar plasma and tissue pharmacokinetics properties as well as preferential tumor distribution until 96 h after an iv administration in mice bearing H460 xenografted tumors. Citation Format: Tiziana Pernice, Alan Bishop, Oscar Cataluña, Mandy Palomares, Raquel Lopez, Práxedes Núñez, Carmen Cuevas, Maria José Guillén, Pablo M. Aviles. Plasma, tissue and tumor pharmacokinetics of PM060184 in NSCL xenograft mouse model. [abstract]. In: Proceedings of the 105th Annual Meeting of the American Association for Cancer Research; 2014 Apr 5-9; San Diego, CA. Philadelphia (PA): AACR; Cancer Res 2014;74(19 Suppl):Abstract nr 4654. doi:10.1158/1538-7445.AM2014-4654